1. PENNSYLVANIA STORMWATER BEST MANAGEMENT PRACTICES MANUAL
INTRODUCTION
CHAPTERS 1, 2
Bureau of Watershed Management
DEP

2. Pennsylvania’s Stormwater Best Management Practices Manual
The manual includes:
Performance guidelines & standards.
An inventory of proven BMPs and a process for planning and implementation.
Technical references of planning concepts and design standards that will satisfy Pennsylvania’s regulatory requirements and stormwater management policies when properly tailored and applied to local site conditions.

3. Introduction
The manual is intended to be a tool to achieve the regulatory standard to protect, maintain, and improve the Commonwealth’s water resources through comprehensive site planning and BMP design guidance, while allowing for the continued growth and development of Pennsylvania.

4. Purpose To Improve Stormwater Management throughout Pennsylvania.
Emphasis on Water Quality and Water Resources.
Describes a “new” Stormwater Management approach of prevention first and then mitigation.

5. Manual Principles Slowing runoff down, and not speeding it up;
Preventing potential water quality and quantity problems;
Minimizing problems that cannot be avoided;
Integrating stormwater management into the initial site design process;
Inspecting and maintaining all BMPs.
Managing stormwater as a resource;
Preserving and utilizing existing natural features and systems;
Managing stormwater as close to the source as possible;
Sustaining the hydrologic balance of surface and ground water;
Disconnecting, decentralizing and distributing sources and discharges;

6. Stormwater Management
Relationship Land Use and Water
Integrated Approach
Comprehensive stormwater management planning.
Emphasizes reduction of impacts from development and other activities.
Manage Stormwater:
Volume
Water Quality
Peak Rate
Groundwater Recharge
Stream Impacts

7. Stormwater Management Standard
Post construction stormwater runoff volume, rate and quality should mimic pre-construction stormwater runoff volume, rate and quality to the maximum extent possible.
In Special Protection Waters – There should be no measurable change in post construction stormwater runoff volume, rate and quality.
In Waters other than Special Protection –Any change in post construction stormwater runoff volume, rate and quality shall not impair designated uses.

8. Stormwater Management Approach
First, prevent or minimize stormwater problems through comprehensive planning and development techniques, and
Second, to mitigate any remaining potential problems by employing structural and non-structural BMPs.

9. Stormwater Management
Federal Clean Water Act – 1972
Pennsylvania Clean Streams Law
PA Stormwater Management Act – 1978 (Act 167)
State and Federal Regulations
NPDES Post-Construction Stormwater Management Plans
Municipal Zoning and Ordinances

10. Stormwater Management Program
COMPREHENSIVE SW
POLICY
BMP
Technical
Manual
NPDES
Construction
Permits
Phase II
MS4 Permits
ACT 167
Planning
Program
Courtesy of PADEP

11. Acknowledgements SMOC-Stormwater experts. Interested stakeholders.
Represent federal, state, and local government agencies, environmental groups, planners, land developers, and academia.
Interested stakeholders.
Public focus group meetings.
Public comment period.

12. Chapter 2 Making the Case for Stormwater Management
Stormwater Problems
Hydrologic Cycle

13. Stormwater Problems Large vs. Small Storm Events
Afterthought vs. Forethought
Generic Site Design vs. Customized Design

14. Land and Water Relationship
Hydrologic Cycle.
Pennsylvania Rainfall: Avg. 36” to 44”.
Impacts of Development and Impervious Surfaces.
Water and Environmental Quality.
Pennsylvania Watersheds, Soils, Geology.

15. Success Begins With Planning
Site Analysis
Evaluate Soils
Topography
Hydrology
Receiving water, wetlands
Know/Evaluate Constraints and Opportunities
Carbonate
Mining
Glaciated soils
Locate Stormwater “in the right place”

16. Additional Site Planning Considerations
T&E,Critical Habitat,Sensitive Species
Riparian Buffers, Natural Drainage
Historical/Archaeological
Aesthetics/Scenic
Other Special Value Areas

17. How stormwater is managed on a site-by-site basis affects entire Watershed